I was on the depo provera shot and I was due for my shot Aug 15-27 my boyfriend and I were sexually active we didn't use protection my period was due on the 30th and I am 28 days late. I took 3 pregnancy test and they came out negative I'vebeen having some symptoms like food cravings, neasous, lower back pains, tender boobs, I had a discharge about a week after my missed period.I don't know what it could be